You would have to place your sensor above earth's atmosphere because it blocks out nearly all x-rays. this is why we have the Chandra observatory
hope this helps
The kinetic energy is

and the height of the building doesn't matter at all.

joules
<span>the mechanical advantage of a pulley is 1.0
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You multiply the high length and width and if your using centimeters then divide by 500 and then there's your answer.hoped this helped.